Table 26 Standard deviation (SD) of multiple RGB original and encrypted images.

From: Multiple color images security by SPN over the residue classes of Gaussian integer \(\:Z{\left[i\right]}_{h}\)

Images

Red Channel

Green Channel

Blue Channel

Image 1 Original

1.9380\(\:\times\:{e}^{4}\)

1.9317\(\:\times\:{e}^{4}\)

2.4454\(\:\times\:{e}^{4}\)

Image 1 Encrypted

104.1595

96.2972

101.6994

Image 2 Original

9.5315\(\:\times\:{e}^{3}\)

8.5820\(\:\times\:{e}^{3}\)

1.0732\(\:\times\:{e}^{4}\)

Image 2 Encrypted

72.3821

67.0023

61.9652

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